HP 6125G HP 6125G & 6125G/XG Blade Switches High Availability Configur - Page 13

How Ethernet OAM works, Ethernet OAM connection establishment, Field, Description, OAMPDU type

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Field Subtype Flags Code Description The specific protocol being encapsulated in the Ethernet OAMPDU The value is 0x03. Status information of an Ethernet OAM entity Type of the Ethernet OAMPDU NOTE: Throughout this document, a port with Ethernet OAM enabled is an Ethernet OAM entity or an OAM entity. Table 5 Functions of different types of OAMPDUs OAMPDU type Information OAMPDU Event Notification OAMPDU Loopback Control OAMPDU Function Used for transmitting state information of an Ethernet OAM entity-including the information about the local device and remote devices and customized information-to the remote Ethernet OAM entity and maintaining OAM connections. Used by link monitoring to notify the remote OAM entity when it detects problems on the link in between. Used for remote loopback control. By inserting the information used to enable/disable loopback to a loopback control OAMPDU, you can enable/disable loopback on a remote OAM entity. How Ethernet OAM works This section describes the working procedures of Ethernet OAM. Ethernet OAM connection establishment Ethernet OAM connection is the basis of all the other Ethernet OAM functions. OAM connection establishment is also known as the "Discovery phase", where an Ethernet OAM entity discovers remote OAM entities and establishes sessions with them. In this phase, interconnected OAM entities determine whether Ethernet OAM connections can be established, by exchanging Information OAMPDUs to notify the peer of their OAM configuration information and the OAM capabilities of the local nodes. An Ethernet OAM connection can be established between entities that have matching Loopback, link detecting, and link event settings. After an Ethernet OAM connection is established, Ethernet OAM takes effect on both sides. For Ethernet OAM connection establishment, a device can operate in active Ethernet OAM mode or passive Ethernet OAM mode, but a switch role will be somewhat different depending on the mode. Table 6 Active Ethernet OAM mode and passive Ethernet OAM mode Item Initiating OAM Discovery Responding to OAM Discovery Transmitting Information OAMPDUs Active Ethernet OAM mode Available Available Available Passive Ethernet OAM mode Unavailable Available Available 6

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6
Field
Description
Subtype
The specific protocol being encapsulated in the Ethernet OAMPDU
The value is 0x03.
Flags
Status information of an Ethernet OAM entity
Code
Type of the Ethernet OAMPDU
NOTE:
Throughout this document, a port with Ethernet OAM enabled is an Ethernet OAM entity or an OAM
entity.
Table 5
Functions of different types of OAMPDUs
OAMPDU type
Function
Information OAMPDU
Used for transmitting state information of an Ethernet OAM entity—including the
information about the local device and remote devices and customized
information—to the remote Ethernet OAM entity and maintaining OAM connections.
Event Notification
OAMPDU
Used by link monitoring to notify the remote OAM entity when it detects problems on
the link in between.
Loopback Control
OAMPDU
Used for remote loopback control. By inserting the information used to
enable/disable loopback to a loopback control OAMPDU, you can enable/disable
loopback on a remote OAM entity.
How Ethernet OAM works
This section describes the working procedures of Ethernet OAM.
Ethernet OAM connection establishment
Ethernet OAM connection is the basis of all the other Ethernet OAM functions. OAM connection
establishment is also known as the "Discovery phase", where an Ethernet OAM entity discovers remote
OAM entities and establishes sessions with them.
In this phase, interconnected OAM entities determine whether Ethernet OAM connections can be
established, by exchanging Information OAMPDUs to notify the peer of their OAM configuration
information and the OAM capabilities of the local nodes. An Ethernet OAM connection can be
established between entities that have matching Loopback, link detecting, and link event settings. After
an Ethernet OAM connection is established, Ethernet OAM takes effect on both sides.
For Ethernet OAM connection establishment, a device can operate in active Ethernet OAM mode or
passive Ethernet OAM mode, but a switch role will be somewhat different depending on the mode.
Table 6
Active Ethernet OAM mode and passive Ethernet OAM mode
Item
Active Ethernet OAM mode
Passive Ethernet OAM mode
Initiating OAM Discovery
Available
Unavailable
Responding to OAM Discovery
Available
Available
Transmitting Information
OAMPDUs
Available
Available